12V, 20W hloov DC tswj fais fab mov Circuit Court muaj li ntawm TOP224P
Lub 12V, 20W switching DC tswj fais fab mov Circuit Court muaj li ntawm TOP224P yog qhia nyob rau hauv daim duab. Ob qhov sib xyaw ua ke yog siv rau hauv Circuit Court: TOP224P peb-terminal monolithic switching power supply (IC1), PC817A linear optocoupler (IC2). Lub AC fais fab mov yog rectified thiab lim los ntawm UR thiab Cl los tsim DC high voltage Ui, uas muab lub hwj chim rau thawj winding ntawm lub high-frequency transformer T. VDz1 thiab VD1 yuav clamp lub ncov voltage generated los ntawm cov leakage inductance kom muaj kev nyab xeeb. tus nqi thiab attenuate lub ringing voltage. VDz1 siv P6KE200 qhov hluav taws xob hloov pauv hloov pauv nrog qhov rov qab tawg qhov hluav taws xob ntawm 200V, thiab VDl siv 1A / 600V UF4005 ultra-ceev rov qab diode. Qhov thib ob winding voltage yog rectified thiab lim los ntawm Vla, C2, Ll thiab C3 kom tau 12V tso zis voltage Uo. Tus nqi ntawm Uo yog teem los ntawm cov sum ntawm qhov ruaj khov voltage Uz2 ntawm VDz2, lub pem hauv ntej voltage poob UF ntawm lub LED nyob rau hauv lub optocoupler, thiab qhov voltage poob ntawm R1. Lwm qhov tso zis hluav taws xob qhov tseem ceeb kuj tuaj yeem tau txais los ntawm kev hloov pauv qhov sib piv ntawm lub siab zaus transformer thiab tus nqi hluav taws xob ruaj khov ntawm VDz2. R2 thiab VDz25 kuj muab ib qho preload rau 12V tso zis los txhim kho kev tswj hwm ntawm lub teeb load. Tom qab cov lus tawm tswv yim winding voltage tau kho thiab lim los ntawm VD3 thiab C4, nws muab cov khoom siv hluav taws xob tsis zoo los ntawm TOP224P. Kev tswj lub davhlau ya nyob twg tam sim no tau hloov kho los ntawm R2 thiab VDz2, thiab lub hom phiaj ntawm kev tswj hluav taws xob tau ua tiav los ntawm kev hloov cov khoom tso tawm lub voj voog. Hom-hom choke coil L2 tuaj yeem txo qhov sib txawv-hom to tam sim no tsim los ntawm high-voltage switching waveform ntawm thawj winding txuas nrog D davhlau ya nyob twg. C7 yog ib qho kev tiv thaiv capacitor, uas yog siv los lim tawm qhov cuam tshuam los ntawm kev sib txuas capacitance ntawm thawj thiab theem nrab windings. C6 tuaj yeem txo qhov sib txawv ntawm qhov sib txawv tam sim no tsim los ntawm qhov tseem ceeb thiab kev sib haum xeeb ntawm cov thawj winding tam sim no. C5 tuaj yeem tsis tsuas yog lim tawm lub ncov tam sim no ntxiv rau lub davhlau ya nyob twg tswj, tab sis kuj txiav txim siab tus kheej pib zaus. Nws kuj tseem them nyiaj rau lub voj voog tswj ua ke nrog R1 thiab R3.
Cov kev qhia tseem ceeb ntawm cov khoom siv hluav taws xob yog raws li hauv qab no:
AC input voltage ntau: u=85-265V;
Input grid zaus: fLl=47-440Hz;
Cov zis hluav taws xob (Io=1.67A): Uo=12V;
Cov zis siab tshaj plaws tam sim no: IOM=1.67A;
Cov zis hluav taws xob tas mus li: Po=20W (TA=25 degree , lossis 15W (TA=50} degree);
Kev hloov pauv voltage: η =78 feem pua ;
Qhov tso zis ntau tshaj ripple voltage: ± 60mV;
Ua haujlwm kub ntau: TA =0-50 degree .
